The Coldcard Mk5 is a Bitcoin focused hardware signing device designed with a strong emphasis on offline security and self custody. Built by Coinkite, it prioritises maximum isolation of private keys, ensuring they never leave the device and are never exposed to internet connected systems.
Unlike general purpose hardware wallets, the Mk5 is designed exclusively for Bitcoin, reducing attack surfaces by removing multi asset complexity. It uses dual secure element architecture and open source firmware, allowing advanced users to independently verify how the device operates.
With its improved display, refined keypad, and enhanced NFC and USB-C connectivity options, the Mk5 balances usability with strict security principles. It is built for users who prioritise sovereignty, transparency, and air gapped transaction signing.
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